gecko-dev/gfx/2d/Matrix.cpp

73 lines
1.4 KiB
C++

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "Matrix.h"
#include "Tools.h"
#include <math.h>
namespace mozilla {
namespace gfx {
Matrix
Matrix::Rotation(Float aAngle)
{
Matrix newMatrix;
Float s = sin(aAngle);
Float c = cos(aAngle);
newMatrix._11 = c;
newMatrix._12 = s;
newMatrix._21 = -s;
newMatrix._22 = c;
return newMatrix;
}
Rect
Matrix::TransformBounds(const Rect &aRect) const
{
int i;
Point quad[4];
Float min_x, max_x;
Float min_y, max_y;
quad[0] = *this * aRect.TopLeft();
quad[1] = *this * aRect.TopRight();
quad[2] = *this * aRect.BottomLeft();
quad[3] = *this * aRect.BottomRight();
min_x = max_x = quad[0].x;
min_y = max_y = quad[0].y;
for (i = 1; i < 4; i++) {
if (quad[i].x < min_x)
min_x = quad[i].x;
if (quad[i].x > max_x)
max_x = quad[i].x;
if (quad[i].y < min_y)
min_y = quad[i].y;
if (quad[i].y > max_y)
max_y = quad[i].y;
}
return Rect(min_x, min_y, max_x - min_x, max_y - min_y);
}
void
Matrix::NudgeToIntegers()
{
NudgeToInteger(&_11);
NudgeToInteger(&_12);
NudgeToInteger(&_21);
NudgeToInteger(&_22);
NudgeToInteger(&_31);
NudgeToInteger(&_32);
}
}
}